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\begin{equation}
{\bm \Psi}(t)=({\bf x}^{(1)}(t), {\bf x}^{(2)}(t), \cdots, {\bf x}^{(n)}(t))=\left(
\begin{array}{cccc}
{\bf x}^{(1)}_1(t) &amp;  {\bf x}^{(2)}_1(t) &amp; \cdots &amp; {\bf x}^{(n)}_1(t)\\
{\bf x}^{(1)}_2(t) &amp;  {\bf x}^{(2)}_2(t) &amp; \cdots &amp; {\bf x}^{(n)}_2(t)\\
\vdots &amp; \vdots &amp;    &amp; \vdots\\
{\bf x}^{(1)}_n(t) &amp;  {\bf x}^{(2)}_n(t) &amp; \cdots &amp; {\bf x}^{(n)}_n(t)
\end{array}
\right)\tag{6.5.2}
\end{equation}
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